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china4 china4
  • 04-10-2015
  • Mathematics
Answered

what a^2-2a-3=0 by solving equations by completing the square

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konrad509
konrad509 konrad509
  • 04-10-2015

\(a^2-2a-3=0\\ a^2-2a+1-4=0\\ (a-1)^2=4\\ a-1=-2 \vee a-1=2\\ a=-1 \vee a=3\)

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